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実行結果

DOM要素:階層構造:parent > childの使用例 | jQuery

▼ID名が「main」(黄色い部分)の要素の子要素に赤枠を付けます。

A Span in child
A Span in main

設置サンプルのソース

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="ja" lang="ja">
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
      <meta http-equiv="Content-Language" content="ja" />
      <meta http-equiv="Content-Script-Type" content="text/javascript" />
      <meta http-equiv="Content-Style-Type" content="text/css" />
      <meta http-equiv="imagetoolbar" content="no" />
      <title>DOM要素:階層構造:parent &gt; childの使用例 | jQuery</title>
      <link rel="stylesheet" type="text/css" href="/content/lib/global.css" />
      <!-- JS -->
      <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
      <script type="text/javascript">
         $(function(){
            $("#main > *").css("border","2px dotted red");
          });
      </script>
      <style type="text/css">
         #main { display:block; background:yellow; padding:10px; overflow:hidden; }
         #main button { display:block; float:left; margin:2px; font-size:14px; }
         #main div { width:90px; height:90px; margin:5px; float:left; background:#bbf; font-weight:bold; }
         #main div.mini { width:30px; height:30px; background:green; }
       </style>
   <link rel="stylesheet" type="text/css" href="/common/css/example.css"></head>
   <body id='example3' class='example'><div class="ads" style="margin:32px auto;text-align:center;"></div><h1 class='h'><a href='/'>PHP &amp; JavaScript Room</a> :: 設置サンプル</h1>
<h3 class='h'>実行結果</h3>
      <div id="wrap">
         <h1>DOM要素:階層構造:parent &gt; childの使用例 | jQuery</h1>
         <p>▼ID名が「main」(黄色い部分)の要素の子要素に赤枠を付けます。</p>
<!-- CODE -->
<span id="main">
   <div></div>
   <button>Child</button>
   <div class="mini"></div>
   <div>
      <div class="mini"></div>
      <div class="mini"></div>
   </div>
   <div><button>Grand</button></div>
   <div><span>A Span <em>in</em> child</span></div>
   <span>A Span in main</span>
</span>
<!-- CODE / -->
      </div>
   </body>
</html>